It depends.
The compatibility between zlib License and Mozilla Public License 2.0 depends on the specific clauses and the way the two are combined in your project. Have a qualified lawyer review before redistributing.
| License | Family | Patent grant |
|---|---|---|
| zlib License (Zlib) | permissive | No (implicit at most) |
| Mozilla Public License 2.0 (MPL-2.0) | weak-copyleft | Yes |
zlib License: Permissive, with a misrepresentation-of-origin clause.
Mozilla Public License 2.0: File-level copyleft: modifications to MPL files must be MPL, but linking with non-MPL code is fine.
If you found this page because you're trying to figure out whether shipping a particular dependency is safe, the answer above is a starting point — not a substitute for reading the actual licenses or talking to a lawyer when stakes are high.
LicenseHound walks every transitive dependency in your repo, maps each to its SPDX license, and flags pairs like this one in PR comments. The CLI is free; the team dashboard is paid.